Grain Refinement in Dual-Phase Steels

Mukherjee, Krishnendu; Hazra, Sujoy S.; Militzer, Matthias

doi:10.1007/s11661-009-9899-9

Cited by 87 publications

(50 citation statements)

References 34 publications

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“…Delincé et al 23,24) used cold swaging plus intercritical annealing to produce DP steels of varying grain sizes and analyzed the different strengthening contributions and the resulting mechanical properties by nanoindentation and a grain-size dependent strain hardening model. Mukherjee et al 25) proposed a processing route based on deformation-induced ferrite transformation (DIFT) and studied the effect of molybdenum and niobium on microstructure evolution. In two previous studies, we demonstrated that UFG DP steels can be produced by large strain warm deformation followed by intercritical annealing 26) and clarified the critical importance of a certain manganese content on microstructure evolution.…”

Section: Introductionmentioning

confidence: 99%

Microstructure Control during Fabrication of Ultrafine Grained Dual-phase Steel: Characterization and Effect of Intercritical Annealing Parameters

2012

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An ultrafine grained (UFG) ferrite/cementite steel was subjected to intercritical annealing in order to obtain an UFG ferrite/martensite dual-phase (DP) steel. The intercritical annealing parameters, namely, holding temperature and time, heating rate, and cooling rate were varied independently by applying dilatometer experiments. Microstructure characterization was performed using scanning electron microscopy (SEM) and high-resolution electron backscatter diffraction (EBSD). An EBSD data post-processing routine is proposed that allows precise distinction between the ferrite and the martensite phase. The sensitivity of the microstructure to the different annealing conditions is identified. As in conventional DP steels, the martensite fraction and the ferrite grain size increase with intercritical annealing time and temperature. Furthermore, the variations of the microstructure are explained in terms of the changes in phase transformation kinetics due to grain refinement and the manganese enrichment in cementite during warm deformation.

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Section: Introductionmentioning

confidence: 99%

Microstructure Control during Fabrication of Ultrafine Grained Dual-phase Steel: Characterization and Effect of Intercritical Annealing Parameters

2012

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“…with 0.87 wt pct Mn, resulted in a relatively CG structure consisting of ferrite, martensite and pearlite. Mukherjee et al 14) successfully developed UFG dual phase structures through the industrially more suitable technique of strain-induced transformation. However, this approach would be applicable to hot-rolled products rather than coldrolled and coated sheets that are of primary interest to the current work.…”

Section: Introductionmentioning

confidence: 99%

“…However, there have been a very limited number of © 2011 ISIJ studies to develop UFG dual phase steels in plain low carbon steels. [11][12][13][14][18][19][20] Thus, the present work seeks to examine combinations of cold rolling and annealing processing steps to develop UFG dual phase structures in a plain low carbon steel with 0.17C and 0.74Mn (wt pct). A systematic study is presented to investigate the effect of initial structure and processing parameters such as heating rate and intercritical annealing time on the microstructure evolution and resulting mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

Formation of Ultrafine Grained Dual Phase Steels through Rapid Heating

2011

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In this study, ultrafine grained dual phase structures have been developed in a plain low carbon steel, 0.17C and 0.74Mn (wt pct). The approach is based on rapid heating of a very fine ferrite-carbide aggregate into the intercritical annealing region followed by water quenching. This rapid heat treatment results in an ultrafine grained dual phase steel with improved properties. The effect of thermomechanical processing parameters such as heating rate and intercritical annealing time on the microstructure and mechanical properties have been examined. The key factors contributing to the grain refinement are uniform distribution of nanosize cementite particles acting as potential sites for austenite nucleation as well as the limited time available for coarsening of the microstructure. The mechanical properties of the present ultrafine grained dual phase steel show an excellent combination of strength and uniform elongation because of considerable work hardening.

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“…In particular, dual-phase (DP) steels, which exhibit excellent mechanical properties such as high strength, low yield ratio, high work hardening rate, continuous yielding, and good formability, have received more attention (Yousef, 2014;Mukherjee, 2009). DP steel is composed of a soft ferrite matrix, which imparts good elongation, mixed with hard martensite islands, which impart high strength (Dulal, 2014;Ramazani, 2013).…”

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confidence: 99%

“…In the CSP process, dislocation density increases significantly with increasing deformation. During phase change, rapid cooling can retain quite a number of deformation dislocations in the matrix, thus greatly enhancing the intensity of the matrix (Mukherjee, 2009). The dislocation density decreases with lower cooling rate and higher coiling temperature (Anijdan, 2012).…”

mentioning

confidence: 99%

Effects of rolling and cooling process on mechanical properties and microstructure of 600 MPa microalloyed dual-phase steel produced by compact strip production

Wu¹,

Liu²,

Zhou³

2016

J. S. Afr. Inst. Min. Metall.

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The application of advanced high-strength steels (AHSS) has been growing rapidly in the automotive industry because of their high strength, good formability, weight reduction potential, and energy savings (Jun, 2013; Maciej, 2014). In particular, dual-phase (DP) steels, which exhibit excellent mechanical properties such as high strength, low yield ratio, high work hardening rate, continuous yielding, and good formability, have received more attention (Yousef, 2014;Mukherjee, 2009). DP steel is composed of a soft ferrite matrix, which imparts good elongation, mixed with hard martensite islands, which impart high strength (Dulal, 2014;Ramazani, 2013). This microstructure leads to high strength and excellent ductility compared to conventional low-carbon and high-strength low-alloy steels. In conventional processing of hot-rolled DP steel, elements such as silicon, chromium, and molybdenum are added in order to produce ferrite and martensite phases after hot working, cooling, and coiling. However, there are some problems such as the high costs of alloying elements and the poor fatigue properties of steels produced by conventional

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Grain Refinement in Dual-Phase Steels

Cited by 87 publications

References 34 publications

Microstructure Control during Fabrication of Ultrafine Grained Dual-phase Steel: Characterization and Effect of Intercritical Annealing Parameters

Microstructure Control during Fabrication of Ultrafine Grained Dual-phase Steel: Characterization and Effect of Intercritical Annealing Parameters

Formation of Ultrafine Grained Dual Phase Steels through Rapid Heating

Effects of rolling and cooling process on mechanical properties and microstructure of 600 MPa microalloyed dual-phase steel produced by compact strip production

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